Device detects interruption of ground connection in three-wire electrical equipment and shuts off ac power to prevent shock hazard. Silicon-controlled rectifiers detect floating ground, and deenergize optoelectric relays thereby breaking power connections. Circuit could be incorporated into hand tools, appliances, and other electrical equipment.
Simple circuit monitors "third wire" in ac lines
NASA Tech Briefs ; 5 , 1
1980-08-01
Sonstige
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Englisch
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